<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>demo</title>
</head>
<body>
    <canvas id="c" width="800px" height="600px"></canvas>
    <img id='bg' src="" alt="bg" style="display: none;">
    <script src="core.js"></script>
</body>
</html>